Portable battery charging and audio unit



FIG. 1 is a front right perspective view of the present new design for a portable battery charging and audio unit;

FIG. 2 is a front elevational view thereof, the rear elevational view being identical;

FIG. 3 is a right elevational view thereof, the left elevational view being identical; and,

FIG. 4 is a top plan view thereof, the bottom plan view being identical.

The broken lines showing various features of a portable battery charging and audio unit are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portable battery charging and audio unit, as shown and described. 